The New York Times bestselling author of Behind Her Eyes returns with a twisty, hair-raising psychological thriller about a single mom, her daughter, and her best friend, the secrets they hide, and the danger they can't escape.

"Sarah Pinborough is about to become your new obsession."—Harlan Coben

Lisa lives a very quiet life. A single mother nearing forty, she devotes herself to raising her sixteen-year-old daughter, Ava. Wary of men, Lisa doesn't speak of her past or Ava's absent father. Her best friend Marilyn wishes she would open up more and maybe finally go on a date—with the sexy new client who's obviously keen—but Marilyn has problems of her own.

Ava is getting tired of her overprotective mother. She wants to live like a normal teenager—chill with friends, go to swim practice, study for exams, have a boyfriend. Her mom would freak if she knew that Ava's already got someone special, someone who makes her feel sophisticated—and wanted.

Lisa has spent a long time looking over her shoulder, but lately she's been especially uneasy. Small things from the past have begun to appear in the present, feeding her anxiety. As her life begins to unravel, Lisa knows that the only way she can protect herself and her daughter is to face her fears. Yet courage won't be enough. She'll need help from the only person she can trust—Marilyn. Between them they have to save Ava, and to do that, they have to be honest with each other. Truly honest. Marilyn did promise she'd do anything to help.

But a long time ago, Lisa made a promise too. Then she broke her word. And that betrayal hasn't been forgotten—or forgiven.

Now, someone is going to make her pay for her sin.